Ebwaed how



P D. am m .9 W R m R METHOD OF MAKING BALANCE WHEELS FOR WATCHES, a

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Weenie ms ween ee; ri -mm z To ALL-WHOM IT MAY coscs'sm I I I U v Be it"kuowu that I, EDWARD HOWARD; of Boston, in the couutyfot'jsnfi'olbaud Ste rte of Massachusetts,

have invented emes useful improveuren't in the .fMsnufacture of Balance-Wheels of. Watchesf add I do. hereby declare thetth'e follow ng v is afull and exact descriptiou thereof.refercnue being bad is the'accomps nyiug dressings 'and to thelettei's and figures iuurkeditherecn.

' Figurelis a vertical scann r a. crucible, u brass-tube,- end u'steelrcd.

FigureIL horisdutal section on the'line yr Figure HE'fi'out'view o'fisteel rcd and the steel and brass disks. Figure lV jvertical sectionof same. I Y Figure'Y,- bu lsnce-w'heel completed.

, My' improvement doesg-not relate to lthe torus 'orshepe'ot' s' balance for chronometers, svstches 'ind clock fl but it consists in anew ruode otmethodof manufacturing balances of the common construction. One cf-these wheelsis represented at Fig. V, and the iuipro'veinen-t herein described is embraced mainly in thebr'sssand st el;

' rings land B, ,Which ereiirnil y united to each otherliu asir'n ble and effective menner,:and at rnuch less-best" than-by the process in common use.- '-'.Watc'h-belanees have usually been made by forming a circular cavityiu pl'nmbago, of s little larger diameter. than the sin of the balzrncemheel, and placing iu' thevcentre of the cavity":

a' steel. buttcu'ordisk'of about the thickness that the balance is required to hemede. Filings 'und scrspsjof brass Ere thenplscedin the annular cavity urouudfthe steel disk; the .whole is'tben exposedto euificient heat" to;

melt the and te adhere {cilia-periphery cftbejsteel' rh'sln 'When madein this ws'y;

wheels are worthless audjmhst" be, rejected on uccbunt'of' the want of perfect adhesion (if the two'ruetuls. 'l .o produce a good balance the brass requires to be hardened hyt'ha lnmering, end during this .procesit i'slliable to start up endpeel'ofi' from the steel. This wuntof'udhesion is chiefly due to the cxidation of the-steel when the heat is applied to it. ByY-myprocess the air is-ezcluded, the brightest-feces of the brass and steel being in close contact until the unmanned. By the u'se'of my-iuipro vement' a large number of buttgns or disks are cut from the same rod, allof which ereprecis ely alike, having been subjected to but 'one uniformheat.

1 first provide a crucible, C, Fig. I, about fouror-fi ve iuches decp; nearly'cylindricsbuhdof suchdismeter that its inner surface will be nearly in contact with the brass tube E; whichis to be melted and forur theexte;

riorring A,'Figs. IV arid V, of the balance: The'brass tube may. be'three or four inches long, and it isihighly nolished on the inside. The; steel rod or cylinder G is turned smooth," and after being heated to drive on rnoisture is coetedwith irst'roug solution cf bcrax. It is then driven into the polished tulle E, thus-bringing the surfaces of the brass and steel in closecontnct'and, preventingtheir exposure to air. Thesteel cylinder is riotdriren to the bottom of the tube, the space,L,'Fig'. I, being left racantf When the tube melts the cylinder G settlesdowu.

and the brass thatws's belo.v=;the level II fills the circular csyity D between the outside-of the -'tube end the inside of the crucible, and thus keeps the melted brass eta higher level with reference to the central tube,

when cold the crucible is broken and the steel roll with its brass coating is taken out. his then placed in the lathe (on the same centres used for turning thesteel rod beforeit was coated) and the brass is turned down to the size required for'the periphery of the-balance .It is-then sswed or turned, asin Figs. III and IV, into disks or battens of suitable breadth thus producing a large number of disks, -w'it b, but one melting, end all having exactly the sinus thickness of bl'asmnhichsdl iferee firmly to tbemetisbaud will mit. star-t up when it is hardened by hammering. The inner steel rim 3-, Fig. "I, and the centre bar J',:ere then finished in the-usual manner.

Whs'tl claim; and desire to secure by Letters ateut, is' Y The process dr mo' e of making sf'se ries ofbalance-wheel disks or buttons by'the use of I tlie.crncible, the' brass tube, end'the steel rod, substantially as herein described end for the purpose specified.

' EDWARD'HOWARD. [I.. s.] Witnesses: v

Tues. P. Psexmm, W. W. Wessex. 

